1. these experiments are not dangerous at all if one strictly follows the protocol and safe measures; if you don't know, go online and read about it, very important! 2. These experiments could potentially deadly if one is sloppy about it and it could pose danger to entire lab; thus it is very bad but somewhat common for beginners to be over brave and sloppy with things of potentially high risk...When I say deadly, it doesn't mean tomorrow or a next year, one may never even know it... The same applies to some other procedure of potential dangers, for example EB, chemicals etc... So paranoid about it is good but be knowledgeable about it is more important , and don't be too paranoid though...